Light vector mediators at direct detection experiments

Abstract

Solar neutrinos induce elastic neutrino-electron scattering in dark matter direct detection experiments, resulting in detectable event rates at current facilities. We analyze recent data from the XENONnT, LUX-ZEPLIN, and PandaX-4T experiments and we derive stringent constraints on several $U(1{)}^{\prime }$ extensions of the Standard Model, accommodating new neutrino-electron interactions. We provide bounds on the relevant coupling and mass of light vector mediators for a variety of models, including the anomaly-free $B-L$ model, lepton flavor-dependent interactions like $L_{\alpha }-L_{\beta }$, $B-2L_e-L_{\mu ,\tau }$, $B-3L_{\alpha }$, and $B+2L_{\mu }+2L_{\tau }$ models. We compare our results with other limits obtained in the literature from both terrestrial and astrophysical experiments. Finally, we present forecasts for improving current bounds with a future experiment like DARWIN.

arXiv commentv2: matches published version, v1: 19 pages, 5 figures, 1 table

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